Human Molecular Genetics Advance Access published online on December 21, 2006
Human Molecular Genetics, doi:10.1093/hmg/ddl460
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© The Author 2006. Published by Oxford University Press. All rights reserved
Multiple ADH genes modulate risk for drug dependence
1 Departments of Psychiatry and 2 VA Connecticut Healthcare System, West Haven, CT 3 University of Connecticut School of Medicine, Alcohol Research Center, Department of Psychiatry, Farmington, CT 4 Department of Biostatistics, Mailman School of Public Health, Columbia University, New York, NY 5 Department of Psychiatry, University of California School of Medicine San Diego, La Jolla, CA Neurobiology, Yale University School of Medicine, New Haven, CT
Corresponding author and reprints: Joel Gelernter, MD; Yale University School of Medicine; VA Psychiatry 116A2; 950 Campbell Avenue; West Haven, CT 06516; email: joel.gelernter{at}yale.edu; Tel: 203-932-5711 ext 3590; Fax: 203-937-3897
Received October 13, 2006; Revised December 6, 2006; Accepted December 6, 2006
Drug dependence (DD) is commonly co-morbid with alcohol dependence (AD). Many studies have also shown common genetic risk factors for these disorders. We previously reported associations of AD with seven ADH genes. The present study examines the relationship between these genes and DD. We genotyped 16 markers within the ADH gene cluster and 38 unlinked ancestry-informative markers in a case-control sample of 718 individuals. All markers were consistent with Hardy-Weinberg Equilibrium in controls, but some markers showed Hardy-Weinberg Disequilibrium in cases (minimal p=0.002). Genotypes of many markers were associated with DD, both before and after controlling for admixture effects (minimal p<1.0x106). Diplotype trend regression analysis showed that ADH5 and ADH6 genotypes, and diplotypes at ADH1A, ADH1B, ADH1C, and ADH7 (minimal p=0.002), were associated with DD in European Americans and/or African Americans. This first report of an allelic association of these loci with DD provides new insight into the mechanism of genetic risk for DD. These findings, obtained using a series of powerful and reliable analytic methods, may also help to explain the high rate of comorbidity between AD and DD.